whakamutunga - ending, conclusion (whakamutu + nominal suffix -nga)
whakamutunga. 1. n. Youngest child. Na te kaha o te whakamutunga, nana i tango ake, ana, ka whai whenua (T. 29).
2. a. Concluding.
Williams Dictionary
Ki a Māmā te kōrero whakamutunga.Mum will have the final say.Who is going to... - Ki a wai te...?